This was originally discussed here but I felt it needed to be mentioned again.
Similar to the "alternate street name" field, having a field for towns/counties/subdivisions under the "city" text box would be a beneficial feature. I feel like there's a lot of large cities that are commonly referred to by their subdivisions and likewise edited as such. Ottawa, for example, is comprised of many separate towns that have been amalgamated into one city.
Many of these smaller areas have been put into the city field and have caused some inconsistencies. So having Country, State, City, and Subdivision fields would really help reduce these issues.